* {
  margin: 0;
  padding: 0;
}
li {
  list-style: none;
}
.outbox {
  width: 80%;
  height: 100%;
  margin: 0 auto;
  overflow: hidden;
}
.outbox .top_top button {
  width: 100px;
  height: 30px;
  font-size: 16px;
  margin-top: 20px;
  margin-left: 10px;
}
.outbox .top {
  width: 100%;
  text-align: center;
}
.outbox .top h1 {
  padding: 15px;
}
.outbox .mainbox {
  width: 100%;
  display: flex;
  justify-content: space-evenly;
  flex-wrap: wrap;
}
.outbox .mainbox .classmate {
  margin: 8px;
  width: 150px;
  height: 60px;
  color: #fff;
  text-align: center;
  line-height: 60px;
  border-radius: 6px;
  font-size: 18px;
}
.outbox .foot {
  width: 50%;
  margin: 60px auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.outbox .foot .btn {
  width: 120px;
  height: 50px;
  font-size: 18px;
}
.outbox .foot .btnTrue {
  width: 120px;
  height: 50px;
  font-size: 18px;
  border: 1px solid red;
  background-color: red;
  color: white;
}
